Intellectual Property Code
Section 219. Presumption of Authorship. - 219.1. The natural person whose name is indicated on a work in the usual manner as the author shall, in the absence of proof to the contrary, be presumed to be the author of the work. This provision shall be applicable even if the name is a pseudonym, where the pseudonym leaves no doubt as to the identity of the author.
219.2. The person or body corporate whose name appears on a audio-visual work in the usual manner shall, in the absence of proof to the contrary, be presumed to be the maker of said work. (n)